Effects of white LED light and UV-C radiation on stilbenes biosynthesis and phytochemicals accumulation identified by UHPLC-MS/MS during peanuts (Arachis hypogaea L.) germination.

In this study, the effects of white LED light and UV-C radiation (with the same intensity) on stilbenes biosynthesis and phytochemicals accumulation of peanut sprouts were investigated. Results showed that white light radiation promoted the growth of peanut sprouts while UV-C radiation had the opposite effect. Contents of total phenolics, total flavonoids and phytochemicals significantly increased in peanut sprouts treated by white light or UV-C radiation. Besides, light radiation significantly induced stilbenes accumulation by up-regulating the expression of genes and enzymes in stilbenes biosynthesis-related pathway, and UV-C was more effective to promote stilbenes accumulation. Compared with piceid and piceatannol, resveratrol showed the highest accumulation in peanut sprouts treated by light radiation. In summary, white light or UV-C radiation could be used as a method to promote stilbenes biosynthesis and phytochemicals accumulation in peanut sprouts and UV-C was more effective. Keywords: Germination; Peanut; Phytochemicals; Stilbenes; UV-C; White LED light.